From: 9 Immutable Laws of Network Design – Let’s be simple, this is opinion, not law. Network design is network design and each person will have their own unique view on how to build networks. However, to say immutable laws is arrogant and only tells people you’re stuck in your ways; thus, if you stand still you’re falling behind.

Lets Break it down some of the points that made no sense

Avoid Dangling networks – This happens more during network operation than in design. If you have even slightly above normal knowledge about networking some knowledge of configuring a vSwitch or dvSwitch, you’ll never design a “dangling” network. Even if you resort to VTP with pruning, you’ll at least get the auto mechanism to prune when a VLAN isn’t used on a switch (unless you have a tagged port to another switch). Once again, you’ll almost always find this issue stems from poorly operated networks, not from initial design.

Route where needed, not where possible

Seriously? In the face of obvious facts about routing at the edge with redundant, equal cost links is more reliable and efficient, not to mention better documented, the author still chooses to say do this where needed and not possible? Follow the link above to see my reasoning with her.

Simple always wins

I am reminded about the static I received when I introduced OSPF into a network to get rid of static routing protocols and to implement automatic failover and propagation of routes. The only, and I mean only, reason was “it introduces complexity”. What they meant was “I don’t understand it; thus, it is complex”. This isn’t a valid reason because if they had the same level of understanding about OSPF, it would be simple and robust. Thus, simple is relative to the person implementing it. If you hire network staff who aren’t highly educated on advanced networking concepts, you’ll get a basic network. Hire an engineer, CCIE or an advanced CCNP/CCDP, you’ll get a robust network using advanced tools that are simple to understand.

My point here, there are a few topics that are immutable laws, especially as we move towards pushing the network layer into the hypervisor and virtualizing our networks.


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